The Pilgrim's Progress, by John Bunyan. I have never read the book exactly, but ever since I was a child I have listened to a dramatized version of this on tape. As a child the bible was too deep for me to grasp very many concepts, but this, this I was able to understand and glean so much from. I think this book, helped me understand a great deal about redemption, the reason for pain, the list goes on. I will never stop loving this book, as well as the sequel.
"Just as Christian came up to the Cross, his burden loosed from off his shoulders, fell from off his back, and began to tumble down the hill, and so it continued to do till it came to the mouth of the sepulchre. There it fell in, and I saw it no more!"